Esprit Turbo Adapter Improvements

[MrDangerUS]

Esprit exhaust flow improvements

The largest obstacles to Esprit exhaust performance improvement are:

1. boost restriction limited to 7psi (despite advertised 9.5 psi),
2. OE turbocharger turbine exducer port diameter (1.90") is too small for good flow. Replacement turbo turbine should have ~2" exducer to reduce exhaust gases back-pressure /choking.
3. Turbo-to-down pipe adapter, (also acting as an external w/gate gas mixing chamber), is waaay too restrictive.

As I said before, the adapter/extension on the 1984 - 1988 turbos cannot be opened up, because the wall of inner passage tube is too thin. I.D. of the tube measures 1.9" and the wall thickness is only 2.7 mm. If larger /improved turbocharger installation is intended, the OE adapter has to be redesigned!

OEM 84-88 Turbochargers have a restrictive 48mm turbine port (Yikes!).
New turbine cover with a larger port should be found and a new larger wheel fitted. Reduction in back pressure is amazing.
With this mod, the recirculation BOV installation is highly recommended to prevent turbo surges.

If anyone thinks about modifying this area on your Turbo car (late G-body as well as Stevens USA/Australian Esprits equipped with K-Jetronic injection), please be informed, that I am in the process of quoting of the custom adapter with a larger throat.
 

See pics of the prototype, below.  Inner pipe measures = 57/8 mm dia I.D.
5 bolt flange will be replaced by "stock" 4 bolt style flange, like in the last picture.
Please let me know if you want one like that for your car.

At the moment, I can't give you a definite price, but it will drop when more parts are ordered. 

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